1. open terminal and type “lspci” for check your wlan card, if u have Rt2500 it will show like this :
” Network controller: RaLink RT2500 802.11g Cardbus/mini-PCI (rev 01)”.
2. and type “sudo /etc/rc.loca”
3. add the following lines before line exit:
ifconfig wlan0 up
iwconfig wlan0 rate 54M
4. Save and reload your wifi
5. done
others tips
check : http://ubuntuforums.org/showthread.php?p=7605785
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